(function () {
    "use strict";

    var students = [{
        firstName: 'Петър',
        lastName: 'Петров',
        age: 37
    }, {
        firstName: 'Иван',
        lastName: 'Иванов',
        age: 17
    }, {
        firstName: 'Петър',
        lastName: 'Иванов',
        age: 25
    }, {
        firstName: 'Иван',
        lastName: 'Петров',
        age: 80
    }, {
        firstName: 'Георги',
        lastName: 'Раковски',
        age: 193
    }];

    var result =
        _.chain(students)
            .sortBy('age')
            .last()
            .value();

    console.log(result);
}());